The corresponding auditory and visual old/new effects overlapping the stimulus-locked CSD component structure are depicted in Figure 4 at nine representative sites for controls and patients. Across groups and tasks, increased parietal P3 sources (at P3, Pz, P4) were accompanied by increased lateral-frontal sinks (at F7, F8) for old compared to new stimuli, although these effects were somewhat weaker in patients. Interestingly, for spoken words, patients showed increased lateral-temporal sinks (at T7, T8; Figure 4C) for old than new items that coincided with the frontal-parietal sink-source pattern associated with P3 amplitude. A posterior late negativity (LN) that peaked at or around response onset showed inverted old/new effects across modalities and groups.
